Use Resource() class from common Oslo code

In the process of unification of the clients code we should
reuse common functionality from Oslo. Resource() class from ceilometer
duplicates Oslo funclionality, so we replace it with inheritance

Change-Id: I4e4b83252cdc87e8484d15e351cd5dab08f3ed8a

ceilometerclient/common/base.py

@@ -18,8 +18,8 @@ Base utilities to build API operation managers and objects on top of.
 """
 
 import copy
-import six
 
+from ceilometerclient.openstack.common.apiclient import base
 
 # Python 2.4 compat
 try:
@@ -81,7 +81,7 @@ class Manager(object):
         self.api.raw_request('DELETE', url)
 
 
-class Resource(object):
+class Resource(base.Resource):
     """A resource represents a particular instance of an object (tenant, user,
     etc). This is pretty much just a bag for attributes.
 
@@ -89,55 +89,6 @@ class Resource(object):
     :param info: dictionary representing resource attributes
     :param loaded: prevent lazy-loading if set to True
     """
-    def __init__(self, manager, info, loaded=False):
-        self.manager = manager
-        self._info = info
-        self._add_details(info)
-        self._loaded = loaded
-
-    def _add_details(self, info):
-        for (k, v) in six.iteritems(info):
-            setattr(self, k, v)
-
-    def __getattr__(self, k):
-        if k not in self.__dict__:
-            # NOTE(bcwaldon): disallow lazy-loading if already loaded once
-            if not self.is_loaded():
-                self.get()
-                return self.__getattr__(k)
-
-            raise AttributeError(k)
-        else:
-            return self.__dict__[k]
-
-    def __repr__(self):
-        reprkeys = sorted(k for k in self.__dict__.keys() if k[0] != '_' and
-                          k != 'manager')
-        info = ", ".join("%s=%s" % (k, getattr(self, k)) for k in reprkeys)
-        return "<%s %s>" % (self.__class__.__name__, info)
-
-    def get(self):
-        # set_loaded() first ... so if we have to bail, we know we tried.
-        self.set_loaded(True)
-        if not hasattr(self.manager, 'get'):
-            return
-
-        new = self.manager.get(self.id)
-        if new:
-            self._add_details(new._info)
-
-    def __eq__(self, other):
-        if not isinstance(other, self.__class__):
-            return False
-        if hasattr(self, 'id') and hasattr(other, 'id'):
-            return self.id == other.id
-        return self._info == other._info
-
-    def is_loaded(self):
-        return self._loaded
-
-    def set_loaded(self, val):
-        self._loaded = val
 
     def to_dict(self):
         return copy.deepcopy(self._info)